Malicious PDF — malware analysis report

Static analysis result for SHA-256 213aaddfedd1220b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 19:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6092ccf9b8953ed4d0d4fddc7ce26594 SHA-1: d60a61e37304c1c907a8c98ee4aa4e6991b101d9 SHA-256: 213aaddfedd1220b4ec1be568ddae8234d616a8a669d3b83276a8749c31a1daf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pekingtogo.com/uploads/files/maxekiwugex.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///44468432479.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86389039177.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/zokujumoneb.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6781191957.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dipetolejosolak.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/71660414486.pdfIn PDF document text
    • https://ksuskalology.com/images/file/ritilixowupebituzubufol.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/54100113274.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zuvejep.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4b281a0a---4879708134.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/woreledafadasemi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/91209088552.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/fuvumuwifirubitowa.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/naniwigedezus.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/31583267029.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rokuvav.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77400737513.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131748fda9fd---77899860812.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/petopomudegegolu.pdfIn PDF document text
    • https://durimawar.com/contents/files/96746679216.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/38625416406.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/porujemisukejajufo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fenitatifigivivenodipenub.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rafomomivevonesamesog.pdfIn PDF document text
    • https://senfina.top/uploads/files/41359756433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=eagle+eyes+android+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10564 bytes
SHA-256: e513bcaf2f89a74c543c5cd4ea72eb9a0f32c655cf0b9375fe35843471694784
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173